I am looking at a different engine for a Farmall A. The question I have is what is the difference in the kerosene engine vs gas? Do they have any visual difference? The Tractor was originally kerosene and then swapped to what i believe is a Super C engine. I would like to make the engine gas cause i really don't wanna deal with kerosene.ThankJosh

Kerosene engines were started on gasoline, then after warm up were switched to kerosene. The engine will run fine on gasoline, so no kerosene worries.

Observations based on WC Allis, originally dual fuel. External differences were the manifold and carburetor. Manifold had a box on the side to preheat the intake portion. Carburetor had two fuel inlets, one for kerosene and one for gasoline. There were/may be two petcocks on the side of the oil pan. Over the years parts utilized for the kerosene operation were replaced when damaged or no longer functional.

Internally, compression ratio is lower in a kerosene fueled engines than one originally built for gasoline. But, when engine was overhauled, newer pistons may have been installed to increase the compression ratio.

If engine is in decent condition, will fit your tractor, price is right, no concern about possible original kerosene fuel.

If it's the original engine, it's a C113. You should be able to find a tag cast into the engine block that says C113 near the date code tag.

Even if it's got overbore sleeves and pistons in it, it's still considered a C113.

Part of the reason is because there is no way to know what was done to the inside of the engine by looking at the outside. Most any surviving A these days will have overbore pistons and sleeves, giving them a 123 cubic inch displacement.

When i bought the tractor i was given a bunch of extra parts. Some of the parts were super c. I was told that the original owner put the two tractors together. So im just guessing that its a c123. Ill have to look at the block for casting marks. Does anyone know what all the differences in the block were?